Egg Self-taught introduction demo sharing

Directory

• Installation
• Project
  • Connecting to a database
  • Writing model
  • Writing a Controller
  • Add route

2018-08, this article applies to the students who are interested in learning about egg

Complete Project code: Https://github.com/NameHewei/node-egg

Project main file directory structure

|—— app    |—— controller        |—— cook.js    |—— model        |—— cook.js    |—— router.js|—— config    |—— config.default.js    |—— plugin.js|—— package.json|—— README.md

Installation

Official website: https://eggjs.org/zh-cn/

1. NPM I Egg-init-g
2. Egg-init Egg-example--type=simple
3. CD Egg-example
4. NPM I

Start Project

• NPM Run Dev

Project

This article is mainly to build a backend to connect MongoDB to provide API interface

Connecting to a database

1. Introduce the database plug-in and add the following code to the Plugin.js file

exports.mongoose = {    enable: true,    package: ‘egg-mongoose‘,};

1. Add the following configuration in Config.default.js

config.mongoose = {    client: {        url: ‘mongodb://127.0.0.1:27017/database-name‘,    },}

Writing model

Added under Model file, Cook.js file

module.exports = app => {    const mongoose = app.mongoose;    const Schema = mongoose.Schema;    const CookeSchema = new Schema({        _id: { type: Schema.Types.ObjectId },        name: { type: String  },        img: { type: String  },        step: { type: String  }    }, {         versionKey: false    });    return mongoose.model(‘cooks‘, CookeSchema);}

Note If you use _id in MongoDB type, and how to remove the __v version lock field.

Writing a Controller

Add the Cook.js file under the Controller folder

const Controller = require(‘egg‘).Controller;class HomeController extends Controller {  async list() {    this.ctx.response.body = {      result: await this.ctx.model.Cook.find({}, {‘_id‘: 0})    };  }  async listOne() {    const { id } = this.ctx.params    this.ctx.body = {      result: await this.ctx.model.Cook.find({ ‘_id‘: id }, {‘_id‘: 0})    };  }}module.exports = HomeController;

This is used to get the data in the database

Add route

module.exports = app => {  const { router, controller } = app;  router.get(‘/cook/‘, controller.cook.list);  router.get(‘/cook/:id‘, controller.cook.listOne);};

After you have made sure that the database is connected successfully, you can start the project.

This article is only to assist in the rapid construction of a basic egg project, the specific content please refer to: https://eggjs.org/

If you have any questions or errors, please leave a message, thank you! Github Blog Issues

Egg Self-taught introduction demo sharing